Initial commit: Kecalek Android client

Complete Android client for encrypted chat platform.
78+ Kotlin files: crypto (X3DH, Double Ratchet, AES-GCM, Ed25519, X25519,
RSA-PSS), network (TCP/TLS, 50 endpoints), Hilt DI, Room+SQLCipher DB,
Jetpack Compose UI with Catppuccin Mocha theme.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build.gradle.kts

@@ -0,0 +1,6 @@
+plugins {
+    id("com.android.application") version "9.0.1" apply false
+    id("com.google.dagger.hilt.android") version "2.59.2" apply false
+    id("com.google.devtools.ksp") version "2.2.10-2.0.2" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.2.10" apply false
+}